From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprint of a geared shaft showing the forward and coast driven sides of the teeth.
| Identifier | ExFiles\Box 170\2\ img269 | |
| Date | 2nd April 1935 guessed | |
| FORWARD DRIVEN SIDE COAST DRIVEN | ||